An abridgment of Mr. London's Complete system of book-keeping [electronic resource] : Containing, Ist, Those excellent Rules for acquiring the Art of Book-Keeping, never printed before in any Language, by means of which Persons of but a common Genius, and not knowing any thing of the Matter before, have been actually taught how to state, post, examine, and ballance Books of Account, in which the whole Theory of that Art consists, and have also reduced it into Practice, the whole, in three Hours time, or less. 2dly, An Explanation of the Nature and Manner of keeping Accounts on a Merchant's Leidger, in two Sorts of Coin or Specie, at one and the same time; absolutely necessary to be used in case of Consignments abroad. 3dly, A full Demonstration of a most egregious Error committed by Mr. Webster, in his Essay on Book-Keeping, for want of knowing the Method just spoken of. And, 4thly, A Detection of some other very egregious Errors contained in the said Essay. To which is added, 5thly, The Manner of keeping Account of Bank, India, South Sea Stock, &c. after the Italian Method of Book-Keeping; drawn up at the Instance of a Proprietor in the Public Funds some time since, and now first published. By John London, late of Tiverton, Mercht.